What is a blog?
A blog is a website where entries are made in journal style and displayed in a reverse chronological order.
Blogs often provide commentary or news on a particular subject, such as food, politics, or local news; some function as more personal online diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. Most blogs are primarily textual although some focus on photographs (photoblog), videos (vlog), or audio (podcasting), and are part of a wider network of social media.
The term “blog” is a portmanteau of “Web log.” “Blog” can also be used as a verb, meaning to maintain or add content to a blog.
Source: Wikipedia
Blogging has become very popular. It allows content to be published to the Internet in a way that is much more immediate and flexible than publishing a web site.
A blog is something that can be frequently updated - almost like an online diary.
Items are added chronologically. Blogs are usually created by individuals and hence are more personal than most web sites.
Oneof the earliest bloggin web sites was blogger.com which still exists.
Blogs range from the serious to the ideosyncratic and trivial.
Blogs have become popular in the media as a way of disseminating news.
Weblogs Compendium has a page of definitions that is useful for beginners